Flash SWF format - Shape

• ベクター画像を表現するタグ。 ビットマップ貼り付けやグラデーションも対応。あとモーフも。

(2) DefineShape†

• http://www.m2osw.com/swf_tag_defineshape

+---------------------------------------------------+
| tag & length | shape_id | rect | shape_with_style |
|  2           |          |      |                  |
+---------------------------------------------------+
< 2 or 6 bytes ><-2 bytes><-RECT->
                <------------------  length -------->

• shape_with_style

+------------------------------------------------------+
|fill_style|line_style|fill_bits|line_bits|   shape    |
|  array   |  array   |  count  |  count  |   records  |
+------------------------------------------------------+
<--     STYLES     --> <-4 bits-><-4 bits-><-- SHAPE -->

• fill_style_array

  +---------------------------------------+
  | count | fill_style | fill_style | ... |
  +---------------------------------------+
  <-1 byte><----- count 個分 ------------->

  • fill_style (solid: type=0x00)

    +-------------------------------+
    | type  |  red  | green | blue  |
    +-------------------------------+
    <-1 byte><-----  3 bytes ------>

  • fill_style (gradient: type=0x10, 0x12, 0x13)

    +-----------------------------+
    | type  |  matrix  | gradient |
    +-----------------------------+
    <-1 byte><-MATRIX->
    * gradient
    +--------------------------------------------------------+
    | pad | count | gradient_record | gradient_record |  ... | 
    +--------------------------------------------------------+
    <4bits><4bits->  <------ count 個分 ---------->
    * gradient_record
    +-----------------------------------+
    | position |  red  |  green |  blue |
    +-----------------------------------+
    <- 1 byte ->< 1byte>< 1byte>< 1byte >

• fill_style (bitmap: type=0x40, 0x41, 0x42, 0x43)

  +-------------------------------------+
  | type  |  bitmap_ref | bitmap_matrix |
  +-------------------------------------+
  <-1 byte> <- 2 bytes -> <-MATRIX->

• line_style_array

  +---------------------------------------+
  | count | line_style | line_style | ... |
  +---------------------------------------+
  <-1 byte><----- count 個分 ------------->

  • line_style

    +--------------------------------+
    | width  |  red  | green | blue  |
    +--------------------------------+
    <-2bytes><-----  3 bytes ------>

• shape_record
  • shape_record_end

    +--------+
    | 000000 |
    +--------+
    <-6 bits->

  • shape_record_setup

    +-----------------------------------------------------+
    | 00WXYZ | move | move| move|  fill  |  fill  | line  |
    |        | size |  x  |  y  | style0 | style1 | style |
    +-----------------------------------------------------+
    <-6 bits-><5bits>/move\/move\/numfill\/numfill\/numline\
                     \size/\size/\ bits  /\ bits / \ bits  /
              <--- if Z==1 ---> <if Y==1><if X==1><if W==1>

  • shape_record_edge

    +--------------------------+
    | 1 |edge_type| coord_size |
    +--------------------------+
    <1bit><-1bit-> <- 4 bits -->

  • shape_record_edge (edge_type:0) spline curve

    +-----------------------------------------------+
    | 1 | 0 | coord |control|control| anchor| anchor|
    |   |   | size  |delta_x|delta_y|delta_x|delta_y|
    +-----------------------------------------------+
    <1bi 1bi><4bits>/coord \/coord \/coord \/coord \
                    \size+2/\size+2/\size+2/\size+2/

• shape_record_edge (edge_type:1) straight line

  +-----------------------------------+
  | 1 | 1 | coord |x_and| delta| delta| slanted line (斜線)
  |   |   | size  |y = 1|  _x  |  _y  |
  +-----------------------------------+
  <1bi 1bi><4bits><1bit>/coord \/coord \
                        \size+2/\size+2/
   ----------------------------------+
              ... |x_and|has_x |delta| horizontal line
                  |y = 0|or_y=0| _x  |
                        |has_x |delta| vertical line
                        |or_y=1| _y  |
   ----------------------------------+
  <1bi 1bi><4bits><1bit><1bit> /coord \
                               \size+2/